First slide

Ray optics

Question

For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied if the refractive index of block will be

Moderate

A

$\frac{\sqrt{3} + 1}{2}$
B

$\frac{\sqrt{2} + 1}{2}$
C

$\sqrt{\frac{3}{2}}$
D

$\sqrt{\frac{7}{6}}$

Solution

$\begin{array}{l} rtθ = 90^{o} θ = c r = 90 - c \\ μ = \frac{sini}{sinr} = \frac{\frac{1}{\sqrt{2}}}{cosc} \end{array}$

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